Pressure regulator



FIG. 1 is a perspective view of a new and ornamental design for a pressure regulator;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a second side elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines showing unclaimed portions in FIG. 3 forms no part of the claimed design. 

The ornamental design for a pressure regulator, as shown and described. 